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Brake booster       #: 1612
 Moderated by: NoPower, Mike69, MaDMaXX,
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 Posted: Tue Apr 30th, 2019 11:03 pm
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Chewy_719
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 Does anyone know why it would be hard to stop in cold weather. I never experienced this until today in any vehicle. We had some crazy weather come in last night and it snowed a bit. When I took my daughter to school it would become hard to stop then it started to act normal. 

On any other day my brakes work perfectly. Can anyone explain this? Could there be water built up in my master cylinder or brake booster?

Last edited on Tue Apr 30th, 2019 11:09 pm by Chewy_719
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 Posted: Wed May 1st, 2019 10:37 am
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JAMMAN

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 Brake fluid is hygroscopic, which means it does absorb water. So does power steering fluid.

Water freezes in the cold.

I'm not saying it isn't your booster but I would do a complete flush of the brake system purging any existing fluid.

I have personally diagnosed a vehicle that would not steer in the cold, and had a horrible belt squeal when it was below freezing. It turned out moisture had formed in the power steering fluid (a hygroscopic hydraulic fluid like brake fluid and a lot of transmission fluids) to the point that it would slow the flow in cold weather till it warmed up.

Like I said I wouldn't discount the booster but wouldn't put all the eggs in that basket.



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 Posted: Wed May 1st, 2019 08:37 pm
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 +1

Full fluid flush



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 Posted: Wed May 1st, 2019 10:44 pm
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Eddie Money
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 I live in a mild climate near Seattle and if I dont drive my ranger for a few days the first 2-3 times I touch the brake it locks up. Afterwards it's fine. I assumed it was rust or scale from morning dew and a couple of scrubs from the brake pad cleared it off. Am I wrong? If its driven the next day it doesnt lock up and brakes as it should. Am i getting moisture in my system  too? It's only an issue if it sets a few days and it's fixed by the time I get to the main road.

Last edited on Wed May 1st, 2019 10:48 pm by Eddie Money



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 Posted: Thu May 2nd, 2019 07:06 am
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JAMMAN

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 Locks up in the front or back?

I'm betting back and first glance it doesn't sound like the same problem the OP was having. Under adjusted rear brakes that are on their last 10% of shoe can do that due to rust and the amount it has to travel before engaging the rear drum. Might be a questionable caliper also hard to tell. Perhaps a detailed scenario in a separate thread, post there every time it does it and the surrounding circumstances and I bet one of us can figure it out.



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 Posted: Thu May 2nd, 2019 09:03 am
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Ordinary Biker
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 Eddie Money wrote:
I live in a mild climate near Seattle and if I dont drive my ranger for a few days the first 2-3 times I touch the brake it locks up. Afterwards it's fine. I assumed it was rust or scale from morning dew and a couple of scrubs from the brake pad cleared it off. Am I wrong? If its driven the next day it doesnt lock up and brakes as it should. Am i getting moisture in my system  too? It's only an issue if it sets a few days and it's fixed by the time I get to the main road.
I'm going with moisture in the shoes.  If the are OEM spec, they are organic composition.  Organics can swell with moisture absorption.  I have something very similar.  If it is wet. rainy, when I first start up, My rear brakes are locked.  Specially if I had the parking brake on, which I always do as it is a 5spd.  Takes a little gas, the brakes break loose and it is fine.  Only when it is wet.  And where you are, it is wet far more often than it is here.  I think someone on the other forum mentioned this as the mechanism for what was happening to me, and the hypothesis does fit.
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 Posted: Thu May 2nd, 2019 09:25 pm
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Eddie Money
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 JAMMAN wrote:
Locks up in the front or back?

I'm betting back and first glance it doesn't sound like the same problem the OP was having. Under adjusted rear brakes that are on their last 10% of shoe can do that due to rust and the amount it has to travel before engaging the rear drum. Might be a questionable caliper also hard to tell. Perhaps a detailed scenario in a separate thread, post there every time it does it and the surrounding circumstances and I bet one of us can figure it out.
Front or back? Good question. I'll need to pay more attention when it does it again. It's more like a hard grab than a full lock. If its damp out as well the tires will make a little chirp. If I drive it everyday it never happens. Only does it after its sat a few days. Pretty sure I have motorcraft pads or whatever the dealer sells because whatever my mechanic used previously squeeked and wore to quick. It 's not a huge concern at the moment because it fixes itself after 2 or 3 presses of the pedal also the truck is also going to 410customs shop this summer to get upgrades so this might not even be an issue afterwards. I'm thinking ordinary biker might be onto something.



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 Posted: Mon May 6th, 2019 10:05 am
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Chewy_719
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 When i flush my brakes and clutch I will let y'all know how it goes. With the warm weather its working perfectly fine, but the fluid is pretty dirty so it will be changed out.
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